巴克豪森噪讯无缝线路应力检测仪的研制及应用

Development and application of a Barkhausen noise continuous welded rail stress detector

利用磁巴克豪森效应原理研制了巴克豪森噪讯无缝线路应力检测仪,该检测仪可用来检测铁轨的内部应力、表面硬度及疲劳损伤,可以实现在线、瞬态以及便携式测量。通过在北京丰台区工务段选取一段无缝线路,采用该仪器对此段无缝线路的缓冲区、伸缩区以及固定区进行定点检测,研究整根铁轨内部残余应力的变化,发现铁轨内的残余应力基本维持在一个固定的数值,从实验过程和结果得出该检测技术是可行的。

A Barkhausen noise continuous welded rail stress detector has been developed based on the magnetic Barkhausen effect.This detector can be used to detect the internal stress,skin hardness and fatigue damage of ferromagnetic materials,and results can be obtained instantaneously by using this portable equipment on site.Using a public works section of the continuous welded rail in the Fengtai district of Beijing as an example,the Barkhausen noise stress detector was used to detect the buffer zone,the stretch zone and the fixed zone of the continuous welded rail at fixed points.By studying the changes in internal residual stress of the whole rail,it was shown that the residual stress of the rail has a fixed value.The new detector is practical and provides reliable results.